/* LzFindMt.h -- multithreaded Match finder for LZ algorithms
2017-04-03 : Igor Pavlov : Public domain */

#ifndef __LZ_FIND_MT_H
#define __LZ_FIND_MT_H

#include "LzFind.h"
#include "Threads.h"

EXTERN_C_BEGIN

#define kMtHashBlockSize (1 << 13)
#define kMtHashNumBlocks (1 << 3)
#define kMtHashNumBlocksMask (kMtHashNumBlocks - 1)

#define kMtBtBlockSize (1 << 14)
#define kMtBtNumBlocks (1 << 6)
#define kMtBtNumBlocksMask (kMtBtNumBlocks - 1)

typedef struct _CMtSync
{
  Bool wasCreated;
  Bool needStart;
  Bool exit;
  Bool stopWriting;

  CThread thread;
  CAutoResetEvent canStart;
  CAutoResetEvent wasStarted;
  CAutoResetEvent wasStopped;
  CSemaphore freeSemaphore;
  CSemaphore filledSemaphore;
  Bool csWasInitialized;
  Bool csWasEntered;
  CCriticalSection cs;
  UInt32 numProcessedBlocks;
} CMtSync;

typedef UInt32 * (*Mf_Mix_Matches)(void *p, UInt32 matchMinPos, UInt32 *distances);

/* kMtCacheLineDummy must be >= size_of_CPU_cache_line */
#define kMtCacheLineDummy 128

typedef void (*Mf_GetHeads)(const Byte *buffer, UInt32 pos,
  UInt32 *hash, UInt32 hashMask, UInt32 *heads, UInt32 numHeads, const UInt32 *crc);

typedef struct _CMatchFinderMt
{
  /* LZ */
  const Byte *pointerToCurPos;
  UInt32 *btBuf;
  UInt32 btBufPos;
  UInt32 btBufPosLimit;
  UInt32 lzPos;
  UInt32 btNumAvailBytes;

  UInt32 *hash;
  UInt32 fixedHashSize;
  UInt32 historySize;
  const UInt32 *crc;

  Mf_Mix_Matches MixMatchesFunc;
  
  /* LZ + BT */
  CMtSync btSync;
  Byte btDummy[kMtCacheLineDummy];

  /* BT */
  UInt32 *hashBuf;
  UInt32 hashBufPos;
  UInt32 hashBufPosLimit;
  UInt32 hashNumAvail;

  CLzRef *son;
  UInt32 matchMaxLen;
  UInt32 numHashBytes;
  UInt32 pos;
  const Byte *buffer;
  UInt32 cyclicBufferPos;
  UInt32 cyclicBufferSize; /* it must be historySize + 1 */
  UInt32 cutValue;

  /* BT + Hash */
  CMtSync hashSync;
  /* Byte hashDummy[kMtCacheLineDummy]; */
  
  /* Hash */
  Mf_GetHeads GetHeadsFunc;
  CMatchFinder *MatchFinder;
} CMatchFinderMt;

void MatchFinderMt_Construct(CMatchFinderMt *p);
void MatchFinderMt_Destruct(CMatchFinderMt *p, ISzAllocPtr alloc);
SRes MatchFinderMt_Create(CMatchFinderMt *p, UInt32 historySize, UInt32 keepAddBufferBefore,
    UInt32 matchMaxLen, UInt32 keepAddBufferAfter, ISzAllocPtr alloc);
void MatchFinderMt_CreateVTable(CMatchFinderMt *p, IMatchFinder *vTable);
void MatchFinderMt_ReleaseStream(CMatchFinderMt *p);

EXTERN_C_END

#endif
